In this paper, a new depth-resolved tomography approach titled laser induced chirp-pulsed radar photothermal tomography (CR-PT) is introduced, and it is employed for the 3D visualization detection for carbon fiber reinforced polymer (CFRP). Initially, the time delay correlation dual orthogonal demodulation (DOD) algorithm is applied to extract the time/frequency-domain characteristic sequence of the chirp-pulsed radar signal, and the applicability of CR-PT is analyzed by COMSOL simulation environment. Subsequently, the correctness of the simulation analysis is verified by the experiment of detecting CFRP with the flat bottom holes by CR-PT. Meanwhile, the accuracy of the shape, position, and depth of the defects detected by CR-PT is determined. Finally, the immersion ultrasonic C-scan imaging and CR-PT are employed to compare and analyze the delamination defect of CFRP composites, which proved the superiority of CR-PT. The experimental results illustrated that CR-PT technique can achieve high-quality 3D geometric reconstruction of CFRP delamination defect, which provides a new attempt and method for quantitative non-destructive evaluation and tomography of CFRP composites.

在本文中，介绍了一种名为激光诱导啁啾脉冲雷达光热断层扫描（CR-PT）的新深度分辨断层扫描方法，并将其用于碳纤维增强聚合物（CFRP）的3D可视化检测。首先，应用时延相关双正交解调（DOD）算法提取线性调频脉冲雷达信号的时/频域特征序列，并通过COMSOL仿真环境分析CR-PT的适用性。随后，通过CR-PT检测平底孔CFRP的实验验证了模拟分析的正确性。同时，确定CR-PT检测缺陷的形状、位置和深度的准确性。最后，采用浸入式超声C扫描成像和CR-PT对CFRP复合材料的分层缺陷进行对比分析，证明了CR-PT的优越性。实验结果表明，CR-PT技术可以实现CFRP分层缺陷的高质量3D几何重建，为CFRP复合材料的定量无损评价和断层成像提供了新的尝试和方法。